منابع مشابه
Radioactive isotopes in medicine: a review.
The following account is very selective: no attempt is made to deal exhaustively with radioisotope applications. In particular, practically no mention is made of treatment using, e.g., 1311, 198Au, or 90Yt, or of the literature dealing with the localizing of tumours, much of which is unprofitable. Circulatory dynamics, e.g., cardiac output, are ignored, as are most biochemical investigations wh...
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There are four fundamental atomic particles-the proton, the neutron, the electron, and the positron. The proton has mass and a unit positive electrical charge. The neutron has mass and no charge. The electron has very small mass compared with the proton and neutron, and has unit negative electrical charge. The positron is the positively charged counterpart of the electron, having equal mass and...
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Introduction:In an ideal parallel-hole collimator, thickness of septal material should be sufficient to stop more than 95% of incident photons. However, some photons pass the septa without interaction or experience scattering before they reach the detector. In this study, we determined different contribution of collimator responses consist of geometrical response, septal penetr...
متن کاملOxygen Isotopes in Meteorites
Oxygen isotope abundance variations in meteorites are very useful in elucidating chemical and physical processes that occurred during the formation of the solar system (Clayton, 1993). On Earth, the mean abundances of the three stable isotopes are O: 99.76%, O: 0.039%, and O: 0.202%. It is conventional to express variations in abundances of the isotopes in terms of isotopic ratios, relative to ...
متن کاملIsotopes in Experimental Pharmacology
The latest volume in this valuable series includes the following chapters: (1) The Determination of Amino Acids by High-Voltage Paper Electrophoresis, by S. Blackburn, who gives useful details for the rapid separation and analysis of amino acid mixtures; this reviewer was not convinced, however, that present-day electrophoretic methods can match ion-exchange chromatography in precision. (2) Mob...
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ژورنال
عنوان ژورنال: Nature
سال: 1952
ISSN: 0028-0836,1476-4687
DOI: 10.1038/170350a0